Are you sure it's not just something that was spilled on the headers? Leaked brake fluid, oil, coolant, ect will stink very quickly after the engine is started, even if it was wiped off. Headers warm up very quickly to 5-600* which is plenty to cause this.
Get an IR thermometer and see how hot they really are. You might be just fine. Like Grey said, and since the bike has been sitting, may just be rusty valve seats not sealing well. A little seafoam and some WOT usually cures that . Valve lash OK? Too tight of a valve would do this. Also retarded ignition timing can makes pipes hot enough to glow.
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